import React, { Component } from 'react'
import "./index.css"

export default class Item extends Component {
  state = {
    mouse: false      // 标识鼠标移入、移出
  }

  // 鼠标移入、移出的回调
  handleMouse = (flag) => {
    return () => {
      this.setState({
        mouse: flag
      })
    }
  }

  // 勾选、取消勾选某一个todo的回调
  handleCheck = (id) => {
    return (event) => {
      console.log(id, event.target.checked)
      this.props.updateTodo(id, event.target.checked)
    }
  }

  // 删除某一个todo的回调
  handleDelete = (id) => {
    if(window.confirm("确定删除吗？")) {
      this.props.deleteTodo(id)
    }
  }

  render() {
    const { id, name, done } = this.props
    const { mouse } = this.state
    
    return (
      <li style={{backgroundColor: mouse ? 'orange' : 'white' }} onMouseLeave={this.handleMouse(false)} onMouseEnter={this.handleMouse(true)}>
        <label>
          <input type='checkbox' checked={done} onChange={this.handleCheck(id)}/>
          {/* <input type='checkbox' defaultChecked={done} onChange={this.handleCheck(id)}/> */}
          <span>{name}</span>
        </label>
        <button onClick={() => this.handleDelete(id)} className='btn btn-danger' style={{display: mouse ? 'block' : 'none'}}>删除</button>
      </li>
    )
  }
}
